天地传说之鱼美人
“翘边”的银河系，居然还“起皱”_我的网站
一 | 夜空中的银河看似一张扁平、光滑的旋转圆盘，但实际上，这张“圆盘”并没有看上去那么简单。中国科学院紫金山天文台科研团队在银河系分子气体外盘中首次发现广泛分布的波纹状褶皱结构。这一发现为理解银河系三维结构及其动力学演化提供了新的关键观测证据。
二 | 相关研究成果8月7日发表在国际期刊《自然·天文学》上。
三 | 银河系的整体形状像一块受热变形的唱片，一侧向上翘起、另一侧向下弯曲。科学家把银河系的这种大尺度形变称为“翘曲结构”。然而，银河系中更细尺度的垂直结构是怎样的，长期缺乏系统性的观测与定量研究。 "The new round of illegal and unjustifiable sanctions once again demonstrates Ottawa’s biased and thoughtless position on the Ukrainian crisis," the statement said on Tuesday.,Global Affairs Canada announced earlier on Tuesday that the government imposed new Russia-related sanctions targeting 43 military officials and 17 entities linked to the special military operation in Ukraine.,"Canada’s government without any evidence is trying to blame the Russian side for the provocations and false flag operations clearly staged by the Kiev regime, such as Bucha," the embassy said.,Moreover, Canadian authorities and media outlets deliberately turn a blind eye on to egregious crimes committed by the Ukrainian military which keeps on shelling the civilian areas of Donbas with Western heavy weapons, the embassy added.,This includes killing children at playgrounds with anti-personnel mines PFM-1 "Lepestok" prohibited by the Ottawa convention," the statement said.,In total, Canada has imposed sanctions on more than 2,750 Russian and Belarusian nationals and Ukrainian facilitators of Russia’s operation in Ukraine.,On February 24, Russia launched a special military operation in Ukraine after the breakaway republics of Donetsk and Luhansk requested help to defend them from intensifying attacks by Ukrainian troops. The Russian Ministry of Defense said the operation is solely targeting Ukrainian military infrastructure.。
四 | 科研团队借助紫金山天文台建立在青海省海西蒙古族藏族自治州的13.7米毫米波望远镜“银河画卷”一氧化碳巡天数据，证认出3万余个外盘分子云。“我们对3万多个分子云进行了三维分析。
五 | ”论文第一作者兼共同通讯作者、中国科学院紫金山天文台副研究员孙燕介绍，一氧化碳是追踪冷分子气体的重要“示踪剂”，而分子气体正是恒星形成的原料。 研究团队首先定量构建了银河系一氧化碳外盘的翘曲模型，拟合扣除大尺度翘曲背景后，发现背景结构中呈现清晰的波纹状垂直起伏，这些起伏被称为“褶皱”。 “褶皱表现为大片盘面整体向上或向下偏离，它们可能来自外部引力扰动激发的‘弯曲波’。”孙燕认为，“这很有可能是矮星系等卫星星系从银河系附近飞掠时，其引力对银河系产生了扰动，于是在银河系外盘中激起缓慢传播的‘涟漪’。”（记者金凤 张添福）。
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Published on:09:06:41